US20070177108A1 - Projection device - Google Patents
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- US20070177108A1 US20070177108A1 US11/343,616 US34361606A US2007177108A1 US 20070177108 A1 US20070177108 A1 US 20070177108A1 US 34361606 A US34361606 A US 34361606A US 2007177108 A1 US2007177108 A1 US 2007177108A1
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- Prior art keywords
- lamp housing
- projection device
- heat sink
- air
- lamp
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
Definitions
- the present disclosure relates to a projection device, and more particularly to a lamp housing assembly for a projection device.
- the projection device includes a lamp housing assembly having a front portion and a back portion, wherein the lamp housing assembly is configured to accommodate a lamp, a blower system configured to direct a flow of air across the front portion of the lamp housing, and a heat sink in thermal communications with the back portion of the lamp housing.
- FIG. 1 shows an exemplary embodiment of a projection device.
- FIG. 2 shows a top view of an exemplary embodiment of an optical system for a projection device.
- FIG. 3 shows a top view of the lamp housing assembly and lamp housing assembly cooling system of the embodiment of FIG. 2 .
- FIG. 4 shows an exploded view of the lamp housing assembly and a portion of the lamp housing assembly cooling system of the embodiment of FIG. 2 .
- FIG. 1 shows, generally at 10 , an exemplary embodiment of a projection device, in the form of a digital image projector.
- Projection device 10 includes a body 12 containing the optical, electrical and other components of projection device 10 .
- Projection device 10 also includes a lens 14 for projecting an image onto a viewing surface, and one or more inputs 16 for accepting various inputs from a user.
- Projection device 10 additionally may include a display 18 for displaying information to a user. Such information may include, but is not limited to, a status of the projection device, a status of an input device connected to the projection device, a current date/time, an error message, an identity of the projection device, etc. While the embodiment of FIG. 1 is depicted as a portable front projection device, it will be appreciated that the projection device may also take the form of a larger front projection device intended for a more permanent installation, a rear projection device such as a projection television, etc.
- FIG. 2 shows, generally at 20 , an exemplary embodiment of an optical system suitable for use with projection device 10 .
- Optical system 20 includes a lamp housing assembly 22 , an optical engine 24 , and a projection lens assembly 26 (which includes lens 14 ).
- Lamp housing assembly 22 is configured to house and provide power connections to a lamp housed within lamp housing assembly 22 for producing a beam of light.
- Optical engine 24 is configured to produce an image from the beam of light, and typically includes various optics related to image generation.
- optical engine 24 examples include, but are not limited to, one or more lenses, a color wheel or other light modulator, an integrator for smoothing intensity variations within the beam of light, one or more image producing elements such as a digital micromirror device, a liquid crystal display panel, an LCOS (liquid crystal on silicon) panel, etc. It will be appreciated that this list of components is merely exemplary, and that projection device 12 may include any suitable component or components.
- FIG. 2 also shows an exemplary embodiment of a cooling system, generally at 30 , for cooling lamp housing assembly 22 .
- Cooling system 30 includes a blower/duct assembly 32 for cooling a front portion 34 of lamp housing assembly 22 , and a heat sink 36 for cooling a rear portion 38 of lamp housing assembly 22 .
- FIGS. 3 and 4 show cooling system 30 and lamp housing assembly 22 in more detail.
- Front portion 34 of lamp housing assembly 22 includes a reflector body 40 having a cavity or interior 42 for holding a lamp 44 , and an opening 46 to admit a flow of cooling air into reflector body 40 .
- Reflector body 40 further includes an inner reflective surface 48 for reflecting light emitted by lamp 42 through opening 46 and toward optical engine 24 .
- Rear portion 38 of lamp housing assembly 22 includes an outer surface 50 of reflector body 40 , and also includes a lamp base or fitting 52 .
- Lamp base 52 may include electrical contacts (shown at 54 in FIG. 2 ) for establishing an electrical connection to lamp 44 .
- blower system 32 includes a blower 62 for generating a flow of air, and a duct 64 for directing the flow of air across and into front portion 34 of lamp housing assembly 22 .
- Blower 62 may be any suitable type of blower, including but not limited to fan-type and wheel-type blowers. Blower 62 may be configured to pull cool air from outside of projection device 10 through a vent in body 12 for circulation through front portion 34 of lamp housing assembly 22 , or may be configured to pull air from a location inside of body 12 .
- Duct 64 may have any suitable configuration for directing airflow from blower 62 to front portion 34 of lamp housing assembly 22 .
- duct 64 includes an inlet duct section 64 a extending from blower 62 to front portion 34 of lamp housing assembly 22 , a middle duct section 64 b connected to reflector body 40 to contain cooling air that flows across reflector body 40 , and an exhaust duct section 64 c extending from middle duct section 64 b.
- Inlet duct section 64 a directs air from blower 62 across and into front portion 34 of lamp housing assembly 22 .
- Inlet duct section 64 a may have any suitable configuration for directing cooling air into lamp housing assembly 22 .
- inlet duct section 64 a may be configured to direct air straight across lamp housing assembly 22 in a direction generally perpendicular to a long axis of lamp 44 (which extends generally along an optical axis of device 10 ).
- inlet duct section 64 a may be configured to direct air in a direction at least partially along the long axis of lamp 44 , thereby directing at least a portion of the flow of air into interior 42 of reflector body 40 .
- inlet duct section 64 a includes a first curved portion 66 and second curved portion 68 that directs the flow of air into interior 42 of reflector body 40 and onto lamp 44 . While curved portions 66 and 68 of inlet duct 64 a are depicted as being smoothly curved, it will be appreciated that inlet duct 64 a may also be angled or curved in any other suitable manner. Furthermore, depending upon the relative positions of blower 62 and reflector 64 , inlet duct 64 a may be configured to direct a flow of air straight from blower 62 into interior 42 without any angled or curved portions of inlet duct 64 a.
- Interior 42 of the depicted embodiment is configured such that all air that flows into interior 42 from inlet duct 64 a flows out via exhaust duct 64 c .
- This is opposed to many prior systems, in which air can flow out of the rear portion of the reflector interior via holes provided in lamp base 52 .
- both the front and rear portions of the lamp housing assembly may be cooled by a flow of air from a blower, without the use of heat sink 36 , which may be less effective and/or efficient than the disclosed forced air/heat sink combination cooling system.
- Middle duct section 64 b is configured to contain air delivered from blower 62 by inlet duct 64 a ,and to channel air from inlet duct 64 a toward exhaust duct 64 c .
- Middle duct section 64 b typically includes an opening or window 70 to allow light emitted by lamp 44 to reach optical engine 24 .
- window 70 includes a glass or other transparent barrier 72 for containing glass from lamp 44 in the event of lamp failure. Barrier 72 further helps to contain air flow from blower 62 within the interior of middle duct section 64 b and lamp housing assembly 22 , thereby improving cooling efficiency.
- middle duct section 64 b has a raised configuration to accommodate lamp 44 , which protrudes from interior 42 of reflector body 40 .
- middle duct section 64 b may have any other suitable configuration.
- middle duct section 64 b may have a generally flat configuration rather than a raised configuration.
- Middle duct section 64 b may be permanently attached to reflector body 40 , or may be removably attached to allow lamp 44 to be changed. Where middle duct section 64 b is removably attached to reflector body 40 , it may be removably attached in any suitable manner. Referring to FIG. 4 , the middle duct section 64 b of the depicted embodiment is coupled to reflector body 40 via a contact plate 76 disposed between middle duct section 64 b and reflector body 40 , and one or more screws 78 configured to be inserted through complementary openings in contact plate 76 . One or more brackets 79 connectable to screws 78 may further be used to hold the duct and contact plate to reflector body 40 . In the depicted embodiment, brackets 79 also hold glass barrier 72 in place relative to middle duct section 64 b . Alternatively, glass barrier 72 may be held in place relative to middle duct section 64 b in any other suitable manner.
- Exhaust duct section 64 c directs air out of lamp housing assembly 22 after the air has been used for cooling. Exhaust duct section 64 c may be configured to vent the air into the interior of projection device body 12 , or may be configured to vent the air outside of projection device body 12 via a vent (not shown) in projection device body 12 . As shown in FIG. 4 , exhaust duct section 64 c may include a screen or other similar structure for containing glass from lamp 44 in the event of a lamp failure.
- heat sink 36 is formed from two semicircular sections 36 a and 36 b that are connected to form a substantially circular piece that substantially surrounds a portion of the outer surface.
- sections 36 a and 36 b are identical in structure and are symmetrical, thereby simplifying manufacturing and assembly of lamp housing assembly 22 .
- heat sink 36 may be formed from either more or fewer sections, and that the sections may be symmetrical or asymmetrical.
- the sections may be any other suitable shape than semicircular.
- the shape of the heat sink sections may be influenced at least partly by the geometry of rear portion 38 of lamp housing assembly 22 .
- Heat sink 36 may be formed from any suitable thermally conductive material. Examples include, but are not limited to, highly thermally conductive metallic materials. Likewise, heat sink 36 may include one or more structures configured to increase the surface area and the rate of heat dissipation of heat sink 36 . In the depicted embodiment, heat sink 36 includes a plurality of radially-arranged fins. Alternatively, heat sink 36 may include fins arranged in any other suitable pattern, and/or may include any other suitable structure other than fins for increasing the surface area of heat sink 36 .
- Heat sink 36 may be configured to be in contact with outer surface 50 of reflector body 40 over at least part of outer surface 50 .
- heat sink 36 may be configured to be in contact with outer surface 50 of reflector body 40 .
- heat sink 36 may be configured to be in close proximity to, but not in contact with, outer surface 50 of reflector body 40 .
- a heat-resistant material may be disposed between portions of outer surface 50 of reflector body 40 and heat sink 36 (for example, as gaskets or spacers) to hold the heat sink and the reflector in desired positions relative to one another.
- a configuration may achieve good heat transfer between heat sink 36 and reflector body 40 while allowing for simplified manufacturing.
- Any suitable heat-resistant material may be used in such a configuration. Examples include, but are not limited to, perfluoro rubbers.
- a thermally conductive material may be disposed between heat sink 36 and outer surface 50 of reflector body 40 to further improve the conduction of heat from reflector body 40 to heat sink 36 . Examples of such a thermally conductive material include, but are not limited to, thermally conductive pastes, adhesives, metals, polymers, etc.
- the combination of forced air cooling for front portion 34 of lamp housing assembly 22 and heat sink cooling for back portion 38 of lamp housing assembly 22 may offer improved cooling relative to prior projection devices that utilize a single forced air system for cooling both the front and back portions of lamp housings.
- an additional blower (not provided) may be disposed adjacent heat sink 36 for creating an air flow across heat sink 36 , thereby helping to further cool lamp housing assembly 22 .
- ordinal numbers such as first, second, and third, for identified elements or actions are used to distinguish between the elements and actions, and do not indicate a required or limited number of such elements or actions, nor a particular position or order of such elements or actions unless otherwise specifically stated.
- Other combinations and subcombinations of features, functions, elements, and/or properties may be claimed through amendment of the present claims or through presentation of new claims in this or a related application. Such claims, whether broader, narrower, equal, or different in scope to the original claims, also are regarded as included within the subject matter of the present disclosure.
Abstract
Description
- The present disclosure relates to a projection device, and more particularly to a lamp housing assembly for a projection device.
- An embodiment of a projection device is disclosed, wherein the projection device includes a lamp housing assembly having a front portion and a back portion, wherein the lamp housing assembly is configured to accommodate a lamp, a blower system configured to direct a flow of air across the front portion of the lamp housing, and a heat sink in thermal communications with the back portion of the lamp housing.
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FIG. 1 shows an exemplary embodiment of a projection device. -
FIG. 2 shows a top view of an exemplary embodiment of an optical system for a projection device. -
FIG. 3 shows a top view of the lamp housing assembly and lamp housing assembly cooling system of the embodiment ofFIG. 2 . -
FIG. 4 shows an exploded view of the lamp housing assembly and a portion of the lamp housing assembly cooling system of the embodiment ofFIG. 2 . -
FIG. 1 shows, generally at 10, an exemplary embodiment of a projection device, in the form of a digital image projector.Projection device 10 includes abody 12 containing the optical, electrical and other components ofprojection device 10.Projection device 10 also includes alens 14 for projecting an image onto a viewing surface, and one ormore inputs 16 for accepting various inputs from a user.Projection device 10 additionally may include adisplay 18 for displaying information to a user. Such information may include, but is not limited to, a status of the projection device, a status of an input device connected to the projection device, a current date/time, an error message, an identity of the projection device, etc. While the embodiment ofFIG. 1 is depicted as a portable front projection device, it will be appreciated that the projection device may also take the form of a larger front projection device intended for a more permanent installation, a rear projection device such as a projection television, etc. -
FIG. 2 shows, generally at 20, an exemplary embodiment of an optical system suitable for use withprojection device 10.Optical system 20 includes alamp housing assembly 22, anoptical engine 24, and a projection lens assembly 26 (which includes lens 14).Lamp housing assembly 22 is configured to house and provide power connections to a lamp housed withinlamp housing assembly 22 for producing a beam of light.Optical engine 24 is configured to produce an image from the beam of light, and typically includes various optics related to image generation. Examples of optics contained byoptical engine 24 include, but are not limited to, one or more lenses, a color wheel or other light modulator, an integrator for smoothing intensity variations within the beam of light, one or more image producing elements such as a digital micromirror device, a liquid crystal display panel, an LCOS (liquid crystal on silicon) panel, etc. It will be appreciated that this list of components is merely exemplary, and thatprojection device 12 may include any suitable component or components. -
FIG. 2 also shows an exemplary embodiment of a cooling system, generally at 30, for coolinglamp housing assembly 22.Cooling system 30 includes a blower/duct assembly 32 for cooling afront portion 34 oflamp housing assembly 22, and aheat sink 36 for cooling arear portion 38 oflamp housing assembly 22. -
FIGS. 3 and 4 show cooling system 30 andlamp housing assembly 22 in more detail.Front portion 34 oflamp housing assembly 22 includes areflector body 40 having a cavity orinterior 42 for holding alamp 44, and anopening 46 to admit a flow of cooling air intoreflector body 40.Reflector body 40 further includes an innerreflective surface 48 for reflecting light emitted bylamp 42 throughopening 46 and towardoptical engine 24.Rear portion 38 oflamp housing assembly 22 includes anouter surface 50 ofreflector body 40, and also includes a lamp base or fitting 52.Lamp base 52 may include electrical contacts (shown at 54 inFIG. 2 ) for establishing an electrical connection tolamp 44. - Referring again to
FIG. 3 ,blower system 32 includes ablower 62 for generating a flow of air, and aduct 64 for directing the flow of air across and intofront portion 34 oflamp housing assembly 22. Blower 62 may be any suitable type of blower, including but not limited to fan-type and wheel-type blowers. Blower 62 may be configured to pull cool air from outside ofprojection device 10 through a vent inbody 12 for circulation throughfront portion 34 oflamp housing assembly 22, or may be configured to pull air from a location inside ofbody 12. - Duct 64 may have any suitable configuration for directing airflow from
blower 62 tofront portion 34 oflamp housing assembly 22. In the depicted embodiment,duct 64 includes aninlet duct section 64 a extending fromblower 62 tofront portion 34 oflamp housing assembly 22, amiddle duct section 64 b connected toreflector body 40 to contain cooling air that flows acrossreflector body 40, and anexhaust duct section 64 c extending frommiddle duct section 64 b. -
Inlet duct section 64 a directs air fromblower 62 across and intofront portion 34 oflamp housing assembly 22.Inlet duct section 64 a may have any suitable configuration for directing cooling air intolamp housing assembly 22. For example,inlet duct section 64 a may be configured to direct air straight acrosslamp housing assembly 22 in a direction generally perpendicular to a long axis of lamp 44 (which extends generally along an optical axis of device 10). Alternatively,inlet duct section 64 a may be configured to direct air in a direction at least partially along the long axis oflamp 44, thereby directing at least a portion of the flow of air intointerior 42 ofreflector body 40. In the depicted embodiment,inlet duct section 64 a includes a firstcurved portion 66 and secondcurved portion 68 that directs the flow of air intointerior 42 ofreflector body 40 and ontolamp 44. Whilecurved portions inlet duct 64 a are depicted as being smoothly curved, it will be appreciated thatinlet duct 64 a may also be angled or curved in any other suitable manner. Furthermore, depending upon the relative positions ofblower 62 andreflector 64,inlet duct 64 a may be configured to direct a flow of air straight fromblower 62 intointerior 42 without any angled or curved portions ofinlet duct 64 a. -
Interior 42 of the depicted embodiment is configured such that all air that flows intointerior 42 frominlet duct 64 a flows out viaexhaust duct 64 c. This is opposed to many prior systems, in which air can flow out of the rear portion of the reflector interior via holes provided inlamp base 52. In these prior designs, both the front and rear portions of the lamp housing assembly may be cooled by a flow of air from a blower, without the use ofheat sink 36, which may be less effective and/or efficient than the disclosed forced air/heat sink combination cooling system. -
Middle duct section 64 b is configured to contain air delivered fromblower 62 byinlet duct 64 a,and to channel air frominlet duct 64 a towardexhaust duct 64 c.Middle duct section 64 b typically includes an opening orwindow 70 to allow light emitted bylamp 44 to reachoptical engine 24. In the depicted embodiment,window 70 includes a glass or othertransparent barrier 72 for containing glass fromlamp 44 in the event of lamp failure.Barrier 72 further helps to contain air flow fromblower 62 within the interior ofmiddle duct section 64 b andlamp housing assembly 22, thereby improving cooling efficiency. In the depicted embodiment,middle duct section 64 b has a raised configuration to accommodatelamp 44, which protrudes frominterior 42 ofreflector body 40. However,middle duct section 64 b may have any other suitable configuration. For example, in embodiments where the lamp does not protrude from thereflector body 40,middle duct section 64 b may have a generally flat configuration rather than a raised configuration. -
Middle duct section 64 b may be permanently attached toreflector body 40, or may be removably attached to allowlamp 44 to be changed. Wheremiddle duct section 64 b is removably attached toreflector body 40, it may be removably attached in any suitable manner. Referring toFIG. 4 , themiddle duct section 64 b of the depicted embodiment is coupled toreflector body 40 via acontact plate 76 disposed betweenmiddle duct section 64 b andreflector body 40, and one ormore screws 78 configured to be inserted through complementary openings incontact plate 76. One ormore brackets 79 connectable toscrews 78 may further be used to hold the duct and contact plate toreflector body 40. In the depicted embodiment,brackets 79 also holdglass barrier 72 in place relative tomiddle duct section 64 b. Alternatively,glass barrier 72 may be held in place relative tomiddle duct section 64 b in any other suitable manner. -
Exhaust duct section 64 c directs air out oflamp housing assembly 22 after the air has been used for cooling.Exhaust duct section 64 c may be configured to vent the air into the interior ofprojection device body 12, or may be configured to vent the air outside ofprojection device body 12 via a vent (not shown) inprojection device body 12. As shown inFIG. 4 ,exhaust duct section 64 c may include a screen or other similar structure for containing glass fromlamp 44 in the event of a lamp failure. - Referring again to
FIGS. 3 and 4 ,heat sink 36 is formed from twosemicircular sections sections lamp housing assembly 22. However, it will be appreciated thatheat sink 36 may be formed from either more or fewer sections, and that the sections may be symmetrical or asymmetrical. Likewise, the sections may be any other suitable shape than semicircular. The shape of the heat sink sections may be influenced at least partly by the geometry ofrear portion 38 oflamp housing assembly 22. -
Heat sink 36 may be formed from any suitable thermally conductive material. Examples include, but are not limited to, highly thermally conductive metallic materials. Likewise,heat sink 36 may include one or more structures configured to increase the surface area and the rate of heat dissipation ofheat sink 36. In the depicted embodiment,heat sink 36 includes a plurality of radially-arranged fins. Alternatively,heat sink 36 may include fins arranged in any other suitable pattern, and/or may include any other suitable structure other than fins for increasing the surface area ofheat sink 36. -
Heat sink 36 may be configured to be in contact withouter surface 50 ofreflector body 40 over at least part ofouter surface 50. In general, without wishing to be bound by theory, the closer the proximity betweenheat sink 36 andouter surface 50 ofreflector body 40, the more efficient the heat transfer betweenreflector body 40 andheat sink 36. Therefore, in some embodiments,heat sink 36 may be configured to be in contact withouter surface 50 ofreflector body 40. Alternatively,heat sink 36 may be configured to be in close proximity to, but not in contact with,outer surface 50 ofreflector body 40. In these embodiments, a heat-resistant material may be disposed between portions ofouter surface 50 ofreflector body 40 and heat sink 36 (for example, as gaskets or spacers) to hold the heat sink and the reflector in desired positions relative to one another. Such a configuration may achieve good heat transfer betweenheat sink 36 andreflector body 40 while allowing for simplified manufacturing. Any suitable heat-resistant material may be used in such a configuration. Examples include, but are not limited to, perfluoro rubbers. Furthermore, a thermally conductive material may be disposed betweenheat sink 36 andouter surface 50 ofreflector body 40 to further improve the conduction of heat fromreflector body 40 toheat sink 36. Examples of such a thermally conductive material include, but are not limited to, thermally conductive pastes, adhesives, metals, polymers, etc. - The combination of forced air cooling for
front portion 34 oflamp housing assembly 22 and heat sink cooling forback portion 38 oflamp housing assembly 22 may offer improved cooling relative to prior projection devices that utilize a single forced air system for cooling both the front and back portions of lamp housings. Furthermore, an additional blower (not provided) may be disposedadjacent heat sink 36 for creating an air flow acrossheat sink 36, thereby helping to further coollamp housing assembly 22. - Furthermore, although the present disclosure includes specific embodiments, specific embodiments are not to be considered in a limiting sense, because numerous variations are possible. The foregoing embodiments are illustrative, and no single feature, component, or action is essential to all possible combinations that may be claimed in this or later applications. The subject matter of the present disclosure includes all novel and nonobvious combinations and subcombinations of the various elements, features, functions, and/or properties disclosed herein. The following claims particularly point out certain combinations and subcombinations regarded as novel and nonobvious. These claims may refer to “a” or “a first” element or the equivalent thereof. Such claims should be understood to include incorporation of one or more such elements, neither requiring nor excluding two or more such elements. Further, ordinal numbers, such as first, second, and third, for identified elements or actions are used to distinguish between the elements and actions, and do not indicate a required or limited number of such elements or actions, nor a particular position or order of such elements or actions unless otherwise specifically stated. Other combinations and subcombinations of features, functions, elements, and/or properties may be claimed through amendment of the present claims or through presentation of new claims in this or a related application. Such claims, whether broader, narrower, equal, or different in scope to the original claims, also are regarded as included within the subject matter of the present disclosure.
Claims (20)
Priority Applications (1)
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US11/343,616 US7559657B2 (en) | 2006-01-30 | 2006-01-30 | Projection device |
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US11/343,616 US7559657B2 (en) | 2006-01-30 | 2006-01-30 | Projection device |
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US7559657B2 US7559657B2 (en) | 2009-07-14 |
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US11/343,616 Expired - Fee Related US7559657B2 (en) | 2006-01-30 | 2006-01-30 | Projection device |
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US20090290131A1 (en) * | 2008-05-20 | 2009-11-26 | Samsung Electronics Co., Ltd. | Image projecting apparatus |
CN107490928A (en) * | 2016-06-09 | 2017-12-19 | 卡西欧计算机株式会社 | Fluorescent illuminating device, light supply apparatus and image projection device |
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